In my imaginary extra room for crafts and (eventually) playtime, I would love to have one of these. Just put away your work mid-project and–literally–pick it up where you left off. Can someone please get Ikea to start production?
In the meantime, one could work on breakfast trays and shelve them in a cupboard for a similar result. My family always worked on puzzles on a piece of plywood for quick clean-up.